day_10: basics done but counting all the possible trails

src/advent_of_code/tue_10.rs

@@ -1,5 +1,89 @@
+use utils::read_trail_map_input;
+
 use super::*;
 
 pub fn hoof_it(input: &str) -> usize {
-    0
+    let trail_map = read_trail_map_input(input);
+
+    let vector_of_scores = explore_map(trail_map);
+
+    let mut sum_of_scores: usize = 0;
+
+    println!("The score list is: {:?}", vector_of_scores);
+    // TODO: improve, this is dirty
+    for score in vector_of_scores {
+        sum_of_scores += score;
+    }
+
+    sum_of_scores
+}
+
+pub fn explore_map(map: TrailMap) -> Vec<TrailScore> {
+    let mut trail_score_list: Vec<TrailScore> = vec![];
+
+    for y_index in 0..map.len() {
+        for x_index in 0..map[y_index].len() {
+            if map[y_index][x_index] == 0 {
+                trail_score_list.push(explore_position(x_index, y_index, &map));
+            }
+        }
+    }
+
+    trail_score_list
+}
+
+pub fn explore_position(x: TrailPosition, y: TrailPosition, map: &TrailMap) -> usize {
+    if map[y][x] == 9 {
+        return 1;
+    }
+
+    let mut score_sum: usize = 0;
+    for next_position in get_pos_surroundings(x, y, map) {
+        if map[next_position.1][next_position.0] == map[y][x] + 1 {
+            score_sum += explore_position(next_position.0, next_position.1, map);
+        }
+    }
+
+    score_sum
+}
+
+pub fn get_pos_surroundings(
+    x: TrailPosition,
+    y: TrailPosition,
+    map: &TrailMap,
+) -> Vec<(usize, usize)> {
+    let mut trail_pos_vec: Vec<(usize, usize)> = vec![];
+
+    if x > 0 {
+        trail_pos_vec.push((x - 1, y));
+
+        if y > 0 {
+            trail_pos_vec.push((x - 1, y - 1));
+        }
+        if y < map.len() - 1 {
+            trail_pos_vec.push((x - 1, y + 1));
+        }
+    }
+
+    if x < map[0].len() - 1 {
+        trail_pos_vec.push((x + 1, y));
+
+        if y > 0 {
+            trail_pos_vec.push((x + 1, y - 1));
+        }
+
+        if y < map.len() - 1 {
+            trail_pos_vec.push((x + 1, y + 1));
+        }
+    }
+
+    if y > 0 {
+        trail_pos_vec.push((x, y - 1));
+    }
+
+    if y < map.len() - 1 {
+        trail_pos_vec.push((x, y + 1));
+    }
+
+    trail_pos_vec
 }